stack – Tools to define and use stacks

The pack­age pro­vides a small set of com­mands to im­ple­ment stacks
in­de­pen­dently of TeX's own stack. As an ex­am­ple of how the stacks
might be used, the doc­u­men­ta­tion of­fers a small "re­lin­put" pack­age
that im­ple­ments the back­bone of the
im­port pack­age.